Percent Composition of Hydrates continued Procedure 1. Put on safety goggles and lab apron. 2. Make sure that your equipment is very clean so that you will get the best possible results. Once you have heated the crucible and cover, do not touch them with your bare hands. Remember that you will need to cool the crucible before massing.
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The below answer is good and your answer is not bad. I don't want to tell you which answer is better and You can accept which one you want. $\endgroup$ – Berne Jan 23 '15 at 17:24 $\begingroup$ Fred's answer is very informative, but it adds points to what ron and I said.
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The four that are insoluble are calcium sulfate, calcium carbonate, cornstarch, and potassium bitartrate. To test water solubility, add a pea-sized sample to a test tube, and about 5 mL of water, stopper and shake the test tube. Even if the solid does not completely dissolve, decide if it is soluble or insoluble. B.
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Nov 29, 2016 · Empirical formula and percent composition worksheet will help students understand the concept. Answers have also been provided.
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7) Given the following lab data, determine the empirical formula of the compound. A 2.50 g sample of a hydrate containing copper, chlorine and water was measured out. It was heated until it came to a constant mass of 1.50 g. The remaining solid was allowed to react with a metal to produce 0.71 g of copper.
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1. change the given percent composition into masses (if you assume there is 100 grams, then the numbers remain the same) 2. change the masses to moles (mole-mass conversion) 3. divide each by the smaller of the answers from number 2 4. get rid of decimals suggested order of problems old text p. 135 20a = 2 reactants 20b = 3 reactants
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Percent Composition Worksheet - Solutions Find the percent compositions of all of the elements in the following compounds: 1) CuBr 2 Copper (II) Bromide Cu: 28.45% Br: 71.55% 2) NaOH Sodium Hydroxide Na: 57.48% O: 39.99% H: 2.53% 3) (NH 4)2S Ammonium Sulfide N: 41.1% H: 11.8% S: 47.1% 4) N2S2 Dinitrogen disulfide N: 30.4% S: 69.6% 5) KMnO 4
Find the empirical formula of a compound that is 48.38% carbon, 8.12% hydrogen,and 53.5% oxygen by mass. Strategy: As with most stoichiometry problems, it is necessary to work in moles. Theratio of the moles of each element will provide the ratio of the atoms ofeach element. Get the mass of each element by assuming a certain overall mass for thesample (100 g is a good mass to assume when working with percentages).
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Lab Exercise: Percent Water in a Hydrate Introduction: A hydrate is a crystalline solid that traps water as part of its crystal structure. Each type of hydrate traps water in its own unique way, but heating a hydrate will release the water and leave the dehydrated material behind. The solid remains unchanged except for the loss of the water.
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Apr 08, 2012 · This experiment was done in order to find the percentage composition of a hydrate compound. The mass of the empty beaker, beaker + hydrated Copper (II) Sulfate, and mass of the beaker + anhydrous...
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6. The results for the Hydrate lab using MgSO 4? H 2 O was: Mass of Hydrate: 4.81 grams Mass of Hydrate after drying: 2.19 grams. How many mole of water are there in 1 mole of hydrate? 4.81 – 2.19 = 2.62 g H 2 O / 18 g/mol = 0.145mol. 2.19 / 120 = 0.01825 mol MgSO 4. 0.145/0.01825 = 8. There are: 8 moles of H 2 0 in one mole of hydrate. 7.
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Experimental propane-methane hydrate data are also used to generate enthalpy functions for Structure II hydrate for temperatures between 273 and 286 K. Figure: Methane-Propane Double Hydrate (only 4 cages are shown) Pressure-composition diagram of the mixed methane and propane hydrate system at 270.15 K, 275.15 and 278.15 K.
Multiple Choice (Choose the best answer.) A compound contains 6.0 g of cabon and 1.0 g of hydrogen. The percent composition of the compound is: 14 % hydrogen and 86 % carbon. 86 % hydrogen and 14 % carbon. 17 % hydrogen and 83 % carbon. 83 % hydrogen and 17 % carbon. None of these answers are correct.